$ gst-launch-0.10 "v4lsrc ! ffmpegcolorspace ! ximagesink"
???: \

** (gst-launch-0.10:7935): WARNING **: error: syntax error, unexpected $undefined
???: \
???: \
???: \
Setting pipeline to PAUSED ...
ERROR: Pipeline doesn't want to pause.
ERROR: from element /pipeline0/v4lsrc0: Could not get/set settings from/on resource.
Additional debug info:
v4l_calls.c(409): gst_v4l_set_chan_norm (): /pipeline0/v4lsrc0:
Error setting the channel/norm settings: Invalid argument
Setting pipeline to NULL ...
FREEING pipeline ...